logo

Cambridge IGCSE Biology practice

Paper 6 structured question: Photosynthesis

Try the question first, then check the answer and practise the same topic again.

Attempt questionPhotosynthesis revisionRevise the key idea

At a glance

6

Paper

2

Marks

Topic

Photosynthesis

Exam-style question

Try this first

Paper 6Alternative to PracticalPractical2 marks

An investigation was carried out to study the effect of light and dark conditions on gas exchange in an aquatic plant using hydrogencarbonate indicator solution.

Results Table

Results of Gas Exchange Experiment

The color changes of hydrogencarbonate indicator were recorded after 10 minutes under different conditions.

ConditionColor of Indicator
LightPurple
DarkYellow
  1. a

    Describe Describe the expected color change of the hydrogencarbonate indicator in light and dark conditions.

    Aim for approximately 2 distinct marking points.

    [2]

0 of 1 part answered

Answer every part before opening the mark scheme.

Common mistake

No common mistake is linked to this question yet.

Related flashcards

Flashcard 1 of 6

Press Space to flip, arrows to move

Related practice questions

Question 1 of 5

Choose an answer, get feedback, then move sideways through the set.

0 of 4 attempted

Paper 6 structured question: Photosynthesis

Paper 6Alternative to PracticalPractical3 marks

Method

Method

1. Fill a test tube with hydrogencarbonate indicator solution. 2. Place a piece of aquatic plant (e.g., Elodea) in the test tube. 3. Place the test tube in bright light for 10 minutes and observe the color change. 4. Repeat the experiment by placing the test tube in complete darkness for 10 minutes and observe the color change. 5. Record the color changes in both conditions.

VariableDescription
Independent variable
Dependent variable
Control variables
  1. a

    Plan Suggest how you would improve the method to increase the reliability of the results.

    Aim for approximately 3 distinct marking points.

    [3]